Komatsu 930E-2, Shop Manual

Page: 43 / 739

To Lower Body
(When dumping on flat ground):
It is very likely when dumping on flat ground that the
dumped material will build up enough to prevent the
body from lowering. In this case, the truck will have to
be driven forward a short distance (just enough to clear
the material) before the body can be lowered.
a. Shift Selector Switch to “Forward”, release
Brake Lock, depress Override button and drive
just far enough forward for body to clear mate-
rial. Stop, shift Selector Switch to “Neutral”,
apply Brake Lock.
b. Move hoist lever forward to “down” position and
release. Releasing the lever places hoist con-
trol valve in the “float” position allowing the
body to return to frame.
NOTE: If dumped material builds
up at the rear of the body and the
body cannot be lowered, then per-
form steps "c" and "d" below:
c. Move hoist lever back to the "hoist" position to
fully raise the dump body. Then release the
hoist lever so it returns to the "hold" position.
d. Shift Selector Switch to “Forward”, release
Brake Lock, depress Override button and drive
forward to clear the material. Stop, shift Selec-
tor Switch to “Neutral”, apply Brake Lock and
lower body again.
NOTE: Failure to "hoist" the body after making an
unsuccessful attempt at lowering the body may result
in the dump body suddenly lowering after the truck
has pulled ahead of the material that was previously
preventing the body from lowering.
CAUTION! The truck is not to be moved with the
dump body raised except for emergency moves
only. Failure to lower body before moving truck
may cause damage to hoist cylinders, frame
and/or body hinge pins.
10. With body returned to frame, move Selector
Switch to “Forward”, release Brake Lock, and
leave dump area carefully.
TOWING
Prior to towing a truck, many factors must be carefully
considered. Serious personal injury and/or significant
property damage may result if important safety prac-
tices, procedures and preparation for moving heavy
equipment are not observed.
Do not tow the truck any faster than 5 MPH (8 kph).
Attachments for towing the 930E are available from the
Komatsu Distributor Parts Department as follows:
Front Bumper Modification Kit - MK3941: This kit
contains the parts necessary to modify the front
bumper for installation of towing bosses. One MK3941
kit is required for each truck in the fleet.
Tow Adaptor Structure - MK3945: This structure
must be ordered (or designed) to mate with the in-
tended towing vehicle and is intended for towing an
unloaded vehicle only.
A disabled machine may be towed after the following
MINIMUM precautions have been taken.
1. Shut down engine.
2. If truck is equipped, install hydraulic connections
for steering and dumping between towing and
towed vehicles. Check towed vehicle for braking
system.
3. Inspect tow bar for adequacy (approximately 1.5
times the gross vehicle weight of truck being
towed).
4. Determine that towing vehicle has adequate ca-
pacity to both move and stop the towed truck
under all conditions.
5. Protect both operators in the event of tow bar
failure.
6. Block disabled truck to prevent movement while
attaching tow bar.
7. Release disabled truck brakes and remove block-
ing.
8. Sudden movement may cause tow bar failure.
Smooth and gradual truck movement is preferred.
9. Minimize tow angle at all times - NEVER EXCEED
30
o
. The towed truck must be steered in the
direction of the tow bar.
A03017 General Safety and Operating Instructions A3-29